Bobbin control



L. LEFKWITZ.

BOBBlN CONTROL.

' APPLICATION man Fis. 21, 19ml 1,302,936. Patented May 6, 1919.

V l J'LEWISLEFKOWITZ, OF DANVILLCE, VIRGINIA.

Bonnin CONTROL.

Lacasse.

specification of Letters raient.

Patented May 6, 1919.

Application led February 27, 1918. Serial N o. 219,473.

To all tri/tom, t may concern Be it known'that'l, Lewis Lnrnowi'rz, a citizen of the United States, residing at Danville, yin the county' of Pittsylvania and State of Virginia, have invented a new and useful Bobbin Control, koi which the following is a specification.

` The subject of this invention a bobbin reference control intended for use, primarily, on leather stitchingmachines. y

'In stitching leather it is desirable that the 4thread be waxed, and it is necessary that the thread be used before the thread becomes set orhardens and, for this'reason it is not possible to wind abobbin and hold it in reserve to be placed in the shuttle when the one in the shuttle' becomes exhausted. As 1a consequence it becomes. necessary to stop sewing on the machine when the bobbin isexhausted and rewind the bobbin. This naturally causes a lossl of time and retards the turning out of linished work. The device forming the subject matter oi' the present invention has been designed for the purpose of overcoming these ditliculties. It isvalso within the objects of the invention to provide means for stopping the winding of the bobbin when the same has become iilled.

A further object within the contemplation of the invention is the provision of means for retaining the bobbin in a properly heated condition.

The invention also contemplates the provision of means for locking the bobbin against rotation with respect to the spindle.

A still further object within the contemplation of the invention is the production of a simple, durable and efficient bobbin control.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it l being understood that changes iii the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from. the spirit of the invention.

A practical embodiment of the invention is shown in the accompanying drawing, wherein :m

Figure 1 is a view in elevation, partly in section, of a bobbin control constructed in accordance with the invention, a fragment of the machine to ,which it is attached being shown;

Fig. 2 is a view in side elevation of the device, the door of the housing opened and parts in section;

Fig. 3 is an enlarged detail sectional View substantially on the line 3 3 of Fig. 2.

Referring to the drawing by numerals of A usual supporting arm or bar 1 forming part of a leather stitching machine is illustrated and this bar merges, at one end, into a yoke the prongs of which form a bearing for a spindle 2. The spindle 2 is usually formed with a collar and a reduced end for the reception of the bobbin, the reduced end being threaded to receive a wing nut (not shown) by which the bobbin is clamped against the collar and so held in place. In carrying out the invention, the collar 4 is beveled about its periphery at that face which is contacted by the bobbin, and the threaded end of the reduced end 5 is unnecessary. `A bobbin 6 is mounted on the reduced end 5 and is held against rotation thereon by a pin 4 which extends from the face of the collar 4 and enters an aperture formed in the'lange` of the bobbin for its reception.

Secured to that prong of the yoke of arm 1 adjacent the collar 4 is a leaf spring 7 which extends downwardly beside the collar. A screw 8 is threaded into an extension 1 of the arm l and pivotally supports a cylindrical member or hub 9 from which extends a curved cam arm 10 adapted to contact the spring 7 so that the spring may throw the cam arm and hub when the parts have attained a predetermined position.

An arm 11 also extends from the hub and is positioned to enter edgewise between the flange of the bobbin 6 and the collar 4 so as to force the bobbin off the pin 4 and so release it from rotation with the spindle.

The hub 9 is also formed with an elongated at arm 12 which is adapted to contact the bobbin at that portion between the flanges and upon which the thread 13 is wound. The thread 13 is led in the usual manner from the supply spool and through the wax pot (not shown) and the thread is smoothly distributed on the bobbin 6 be cause of the contacting arm 12 which is yeldingly held against the thread by the spring 7 and cam arm 10.

It will be readily apparent that, as the bobbin fills with thread, the arm 12 is forced outwardlyuntil the cam passes the pointy may be kept in a proper liquid conditio-n to y.

vpermit suitable flexibility or pliability of the thread, a housing or boxing 14 is secured on the arm 1 by screws (not shown) or otherwise. This housing incloses the reduced end of the spindle 2 and the bobbin and is provided with an aperture in its botl tom or floor through which the thread 13 passes. This housing is provided with. an

opening through which access `may be had to the interior for the purpose of removing the bobbin from thespindle or placing it thereon, and this opening is normally closed by a door 15 which is hinged to the housing and held in closed position by a catch 16l or the like.`

A heating element in the form of a compartment or chamber 17 is provided in the housing and an inlet pipe 18 communicates with the chamber 17 Afor the Ipurpose of conducting steam from the regular heating f system of the machine to the chamber. This small quantity ofsteam is sufficient to maintain the wax in a pliable condition.

` While stem has been set forth as the heating means because of the fact that machines of this character are usually heated by steam,it is to be understood that any other heatl producing substance may be used.

It is thought that Athe operation of the device will ybe amply understood from the foregoing, description' without a special extended leiqnlanation thereof.` Y Having thus described the invention, what is claimedfas.` new and sought by Letters Patent, is

A bobbin contro1, including a spindle, a

`bobbin adapted to be mounted Ion `the spindle to *rotate therewith, la hub lpivotally mounted. adjacent thespi'ndle, a bobbin releasing blade extendingv from. the hub, a

thread distributing -inember extending, from the hub, and ymeans for holding the thread distributing, ,member in; contact I with the bobbin, and throwingv the bobbin vreleasing member to release the bobbin ywhen the thread; distributing member yhas moved a predeterminedfdistance in one direction;

In testimony'that vI claim theforegoing as my own, T'havehereto vaiiXed'my signature in the presence of vtwo witnesses.

, y., ,LVEYVIS LEFKOWITZ. Witnesses!` f ,v

D. A. MCKIN'NEY, HARRY B. SLLVERMAN.

Copies of this patent may be obtained for nve cen-ts each, by addressing the "Commissioner of Patents, Washington, D. C. 

